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  Encryption system, encryption device and decryption deviceUSPTO Application #: 20060233366Title: Encryption system, encryption device and decryption device Abstract: An encryption system for surely protecting digital video data or digital audio data from illegal copying. This system has an encryption device and a decryption device. The encryption device includes: an A/D converter; a code setting unit for separately generating a frame check code on first data of each of a plurality of frame data created by collecting unit data by a predetermined number; an encrypting unit for creating chain encrypted data by sequentially performing an encryption processing, on the basis of the frame check code, using encryption results of previous unit data for encryption of next unit data; and an interface. The decryption device includes an interface, a transfer starting unit and a decrypting unit. (end of abstract) Agent: Arent Fox PLLC - Washington, DC, US Inventor: Tetsu Takahashi USPTO Applicaton #: 20060233366 - Class: 380201000 (USPTO) Related Patent Categories: Cryptography, Video Cryptography, Copy Protection Or Prevention The Patent Description & Claims data below is from USPTO Patent Application 20060233366. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This application is based upon and claims the benefits of priority from the prior Japanese Patent Application No.2005-096841, filed on Mar. 30, 2005, the entire contents of which are incorporated herein by reference. BACKGROUND OF THE INVENTION [0002] (1) Field of the Invention [0003] The present invention relates to an encryption system, an encryption device and a decryption device. More particularly, the present invention relates to an encryption system and an encryption device for subjecting time series data to sequential encryption processing by predetermined unit data to create encrypted data and sequentially transferring the encrypted data. The invention also pertains to a decryption device for sequentially performing decryption of time series data encrypted by predetermined unit data. [0004] (2) Description of the Related Art [0005] Conventionally, there is known a system for transferring still image signals, video signals or analog audio (voice) signals after conversion into digital data and allowing the digital data to be displayed on a monitor or to be reproduced from a speaker at a transfer destination (see, e.g., Japanese Unexamined Patent Publication No. 2001-339732). [0006] This system comprises a computer having, for example, a capture board, a video card and an audio card. [0007] This computer has the following three functions of (1) to (3): [0008] (1) a function of compressing inputted AV (Audio Video) analog signals by the capture board, transferring the compressed AV dada to a main memory of the computer via a bus such as a PCI (Peripheral Components Interconnect)/USB (Universal Serial Bus), and further transferring the data to a storage device such as an HDD for storage; [0009] (2) a function of transferring uncompressed digital video data from the capture board to the main memory of the computer via the bus such as the PCI/USB, and further transferring the data to the video card within the computer in real time to display the data on a display; and [0010] (3) a function of transferring uncompressed digital audio data from the capture board to the main memory of the computer via the bus such as the PCI/USB, and further transferring the data to the audio card within the computer in real time to output the data from a speaker. [0011] In addition, the computer can perform one of the above-described functions (1) to (3) or can perform a plurality thereof at the same time. [0012] In the case of the function (1), the AV data are compressed and a content protection signal is added thereto. However, in the cases of the functions (2) and (3), uncompressed digital video data or digital audio data with no protection flow via the bus of the PCI/USB and therefore, the following problem arises. That is, during transfer of the digital video data or the digital audio data, illegal copying of the data easily occurs. SUMMARY OF THE INVENTION [0013] In view of the foregoing, it is an object of the present invention to provide an encryption system capable of surely protecting digital video data or digital audio data from illegal copying, and also to provide an encryption device and a decryption device which are used in the system. [0014] To accomplish the above objects, according to one aspect of the present invention, there is provided an encryption system for subjecting time series data to sequential encryption processing by predetermined unit data to create encrypted data and sequentially transferring the encrypted data. This system includes an encryption device and a decryption device. The encryption device has a code setting unit, an encrypting unit and a transferring unit. The code setting unit separately sets a frame check code on first data of each of a plurality of frame data created by collecting unit data by a predetermined number. The encrypting unit creates chain encrypted data by sequentially performing an encryption processing, on the basis of the frame check code, using encryption results of previous unit data for encryption of next unit data. The transferring unit transfers each of the created chain encrypted data. The decryption device has a receiving unit and a decrypting unit. The receiving unit receives the chain encrypted data transferred by the transferring unit. The decrypting unit creates decrypted data by sequentially subjecting the chain encrypted data received by the receiving unit to a decryption processing using decryption results of previous unit data for decryption of next unit data. [0015] According to another aspect of the present invention, there is provided an encryption device for subjecting time series data to sequential encryption processing by predetermined unit data to create encrypted data and sequentially transferring the encrypted data. This device has a code setting unit and an encrypting unit. The code setting unit separately sets a frame check code on first data of each of a plurality of frame data created by collecting unit data by a predetermined number. The encrypting unit creates chain encrypted data by sequentially performing an encryption processing, on the basis of the frame check code, using encryption results of previous unit data for encryption of next unit data. [0016] According to still another aspect of the present invention, there is provide a decryption device for sequentially performing decryption of time series data encrypted by predetermined unit data. This device has a receiving unit and a decrypting unit. The receiving unit receives chain encrypted data. The chain encrypted data is created by separately setting a frame check code on first data of each of a plurality of frame data created by collecting the unit data by a predetermined number and by sequentially performing an encryption processing, on the basis of the frame check code, using encryption results of previous unit data for encryption of next unit data. The decrypting unit creates decrypted data. The decrypted data is created by sequentially subjecting the chain encrypted data received by the receiving unit to a decryption processing using decryption results of previous unit data for decryption of next unit data. [0017] The above and other objects, features and advantages of the present invention will become apparent from the following description when taken in conjunction with the accompanying drawings which illustrate preferred embodiments of the present invention by way of example. BRIEF DESCRIPTION OF THE DRAWINGS [0018] FIG. 1 is a principle view showing an outline of an encryption system according to the present embodiment. [0019] FIG. 2 shows a hardware configuration of an encryption system shown in FIG. 1. [0020] FIG. 3 shows a VRAW signal displayed on a monitor according to the present embodiment. Continue reading... Full patent description for Encryption system, encryption device and decryption device Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Encryption system, encryption device and decryption device patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Encryption system, encryption device and decryption device or other areas of interest. ### Previous Patent Application: Random number generator Next Patent Application: Method for conditional access in a dmts/docsis enabled set top box environment Industry Class: Cryptography ### FreshPatents.com Support Thank you for viewing the Encryption system, encryption device and decryption device patent info. 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